Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand.
Department of Anatomy, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand.
Anat Sci Int. 2022 Mar;97(2):188-196. doi: 10.1007/s12565-021-00641-8. Epub 2021 Nov 26.
A moderator band, also known as the septomarginal trabecula, is a group of muscle bundles located in the ventricle of almost all human hearts. The morphology of the moderator band has various forms and several studies have focused mostly on its structure. Thus, in the present study, we sought to study the morphology and morphometry of the moderator band and tried to rearrange the criteria based on the previous studies to classify the moderator band in Thais. The study investigated 67 formalin-fixed human hearts of both sexes obtained from Thai donors aged 24-101 years with mean age at death 69.92 years. The moderator band was evident in 66 of the 67 specimens (98.51%). The moderator band had the mean or median of overall length, thickness, distance to the base of the tricuspid valve, distance to the base of the pulmonary valve, distance to the apex of the right ventricle, the angle at the septal connection, and angle of the papillary, which were 18.9 ± 6.4 mm, 3.17 (2.04-4.55) mm, 33.0 ± 7.97 mm, 38.8 ± 9.62 mm, 56.4 ± 8.09 mm, 50 (30-105)°, 73.9 ± 30.1°, respectively. The mean distance originating point from the supraventricular crest to the anterior papillary muscle was 0.396 ± 0.07 of the distance from the base of the tricuspid valve to the apex of the right ventricle. Our present classification found that crest-like and thick moderator band with complex secondary branching at high origin (type IVc), and low origin (type IVd) were the most common subtypes. This study provided both anatomical and clinical information that should be useful in cardiac surgery, radiology, and cardiac electrophysiological interventions.
一条调节束，也被称为隔缘梳状肌，是位于几乎所有人心脏心室中的一组肌束。调节束的形态有多种形式，已有几项研究主要集中在其结构上。因此，在本研究中，我们试图研究调节束的形态和形态计量学，并尝试根据之前的研究重新整理分类标准，以便在泰国人中对调节束进行分类。该研究调查了 67 例来自泰国捐赠者的福尔马林固定的人心，这些捐赠者的年龄为 24-101 岁，平均死亡年龄为 69.92 岁，男女皆有。在 67 个标本中有 66 个（98.51%）有明显的调节束。调节束的整体长度、厚度、到三尖瓣基底的距离、到肺动脉瓣基底的距离、到右心室心尖的距离、在隔连接处的角度和乳头肌的角度的平均值或中位数分别为 18.9 ± 6.4mm、3.17（2.04-4.55）mm、33.0 ± 7.97mm、38.8 ± 9.62mm、56.4 ± 8.09mm、50（30-105）°、73.9 ± 30.1°。从窦房结嵴到前乳头肌的起始点距离与从三尖瓣基底到右心室心尖的距离之比为 0.396 ± 0.07。我们目前的分类发现，起源较高（IVc 型）和较低（IVd 型）处具有嵴样和厚的调节束，并伴有复杂的二级分支，是最常见的亚型。本研究提供了解剖学和临床信息，这对于心脏手术、放射学和心脏电生理介入应该是有用的。
